ELASTOMER COMPOSITION CONTAINING CLAY-REINFORCING AGENT WHICH IS INSERTED THERE IN ELASTOMER HOST AND TAKEN AWAY AND PRODUCT SUCH AS TIRE HAVING AT LEAST ONE KIND OF PART CONTAINING THE COMPOSITION

PROBLEM TO BE SOLVED: To solve the problem that natural clay which can be blended with an elastomer is usually hydrophilic and therefore has comparatively less affinity for a dien-based elastomer. SOLUTION: The clay is changed to be hydrophobic from hydrophilic and further to be compatible with the elastomer by combining in bulk the elastomer host together with smectite clay, preferably montmorillonite clay or hectorite clay, and a hydrocalviruonium salt such as quaternary ammonium salt without adding water to the elastomer host. Therefore, the procedures for the insertion to the inside and at least the partial removal are done by the combination in bulk to the elastomer host at a high temperature under high shearing in contrast to the preliminary insertion of the clay into an aqueous medium and in contrast to a low-viscosity melting treatment of simple thermoplastic polymers.